Basic Electricity
- SI Units
- "The volt (symbol: V)
is the SI derived unit of electric potential difference or
electromotive force."
- The ampere (symbol:
A) is an SI base unit of electric current, or amount of electric
charge per second.
- "The ohm (symbol:
Ω, Greek letter 'Omega') is the SI unit of electrical
impedance or, in the direct current case, electrical
resistance."
- Ohm's law, an
equation that defines the mathematical interrelationship among
potential difference (voltage), current, and
resistance.
- Ohm's
Law (Java applet): The current in a circuit is directly
proportional to the applied voltage (potential difference) and
inversely proportional to the resistance of the circuit.
- Calculation of
Ohm's Law: The Magic Triangle
- "The best way to explain these terms [SI units of electricity] is to
compare them to water. Voltage (V) is the potential for energy to move and
is equivalent to water pressure. Current (I) is a rate of flow and is
measured in amps. Ohms (r) is a measure of resistance and is equivalent to
the water pipe size." Credit: Ask Mr. Solar. See also, Comparing
a DC Circuit to the Flow of Water (Macromedia Flash animation).
- Series- and
parallel circuits:
- series
circuit
- parallel
circuit
- All About [Electric]
Circuits - an e-book
- Multimeter, a
useful tool for measuring electricity and testing circuits. A digital
multimeter can be used to determine the direction in which electrons move
in an electrical circuit.
